At the center of "Cracked" is a special unit of the Toronto police, the Psych Crimes and Crisis Unit: After there had been several incidents in which mentally ill offenders could only be stopped with lethal force by the police, a special unit was formed, cooperate in the psychiatric personnel with police to prevent such an escalation of violence.

When the Property Manager at a seedy Parkdale tenement house winds up murdered, things take a strange turn when a resident with schizophrenia appears with the murder weapon, claiming the devil told him where it was. The team need to sort fact from delusion in their quest for the truth, a quest that leads deep into a terrifying nightmare.